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Welcome to the U.S. ISBN Agency, the official source for ISBNs in the United States. No other source can assign legitimate ISBNs to US publishers. Bowker provides technical advice on uses of the ISBN standard to the publishing industry.  Also in...

The authoritative Collins dictionaries now available online. Search amongst hundreds of thousands of words and expressions in Spanish, French, German, Italian, Chinese, Portuguese, Russian and synonyms dictionaries.

Find opposite or similar words at WordHippo.com.

YouTube is a place to discover, watch, upload and share videos.

Scratch: a programming language for everyone. Create interactive stories, games, music and art - and share them online.

Acronym Finder: The Acronym Finder is a searchable database of over 4 million acronyms, abbreviations and meanings. Covers: common acronyms, computers, science, technology, government, telecommunications, and military acronyms.

Twitter is without a doubt the best way to share and discover what is happening right now.

Prezi is the zooming presentation editor

wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual. Our multilingual how to manual has free step-by-step instructions on how to do all types of things.